Pneumatic ejector.



E. C. BOWDEN-SMITH.

PNEUMATIC EJECTOR.

APPLICATION FILED NOV. 3, 1-913.

1,144,806. Patented June 29, 1915.

4 SHEETSSHEET I.

Witnesses In renbor M W ,B yAZMr/wys,

THE NORRIS PETERS C0,. Pnorauruou WASHING mu, 0. c

E. C. BOWDEN-SMITH.

PNEUMATIC EJECTOR.

APPLICATION FILED NOV. 3. 1913.

1,144,806. Patented June 29, 1915,

4 SHEETSSHEET 2.

M'bnesses 1n renter (W flmden-smilfy M fiJLAflor/wys; W gmm THE NORRIS PETERS co FHOTO LITHCL WASHINGTON, D c.

E. C. BOWDEN-SMITH.

PNEUMATIC EJECTOR.

APPLlCATlON FILED NOV-3.1913.

Wibnesses J27 venar;

THE NORRIS PEIERS'CQ. PHom'LITHov, WASHINGTON, u.

E. C. BOWDEN-SMITH.

PNEUMATIC EJECTOR.

APPLICATION HLED NOV. 3, 1913.

Patented June 29, 1915.

4 SHEETS-SHEET 4.

121 yen 02" THE NORRIS PETERS 60.. PHOfO-LITHQ. WASHINGTON. u I

STATES rare.

PNEUMATIC macros.

Application filed November 3, 1913.

pneumatic ejector-s of the type employed for raising a liquid or semi-liquid, by means of compressed air.

Briefly, the e ectors in common use for raising sewage consist of spherical vessels,

into which the liquid flows by gravitation. When full a weighted float rises on the surface, to this float is attached a rod passing through the crown of the ejector, which actuates certain valves allowing compressed air to exert the necessary force directly on the surface of the liquid, till it has been discharged through the outlet pipe at the base of the ejector, eventually rising through a main to the required level. By this means solid matter is first driven out of the ejector. WVhen the discharge is completed the weighted float falls, closing the air valve and open ing the exhaust, the compressed air escaping to the atmosphere. They are usually worked in pairs, and are arranged in such a manner that although they are entirely automatic they are both alternating or difierential in action, as circumstances requires.

The object of this invention is to utilize a part of the exhaust from the ejector and to use it in an air engine to recompress a part of the exhaust to be used in the ejector again.

An ejector made in accordance with this invention is provided with a motor adapted to be operated by the exhaust from the ejector for the purpose of recompressing a portion of the air from the exhaust of the ejector to a pressure at which it can be used again and an arrangement of valves and parts for automatically controlling and operating the mechanism. The motor and the compressor may each have one or more cylinders and these may besingle or double acting. i

The drawings show apparatus embodying the features of this invention.

Figure '1. is a section showing the general arrangements of parts. Fig. 2. is a sim lar view at right angles to Fig.1. Fig. 3. 1s a sectional plan. Fig. 4c. is a diagram'showing pneumatic control. Fig. l is an enlarged detail of valve 13.

. haust valve.

Specification of Letters Patent. Patented June 29, 1915.

Serial No. 798,914.

It will be seen that the air motor compressor A consists of two double acting air cylinders a and b on either hand, with the single acting compressor 0 in the center. They are mounted on a bed plate (Z, which forms the bottom cover of the two air cylinders, with a similar plate for the top cover, on which are cast the cross head guides. To this top cover are bolted two A frames e which support the crank shaft f and two fly wheels 9 and h. The motor compressor used in connection with this invention is described in my British specification No. 11,381 of 1913.

For thepurpose of explanation, we-will now assume that an ejector has finished discharging, the various automatic valves in their correct position and the exhaust air from the ejector flowing through the pipe to the air motor. The exhaust air from the ejector passed into and fills a jacket surrounding the compressor itself. This jacket, by reason of the hot walls of the compressor, will tend to dry and warm the air before it passes to the air motor cylinders. The air performs its work expansively till at the correct moment the exhaust valve from the ejector opens and the exhaust air which is now at a lower temperature, flows through the exhaust pipes to the suction chamber of the compressor. The cubic capacity of the compressor cylinder being small, relatively to that of the motor cylinders, the compressor cylinder will not have suflicient capacity to draw in the whole of the exhaust air from the two motor cylinders, consequently what is not required will escape from an exhaust on the top of the motor to the atmosphere.

e will follow the air in its course from its entrance by the main to its indefinite consumption, or escape to the atmosphere. It must be understood, that in this system, a certain percentage of the air can be used an unlimited number of times, but the air which is not required escapes automatically either by the atmospheric pipe, from the suction chamber of the compressor or by the exhaust valve hereinafter termed the differential ex- The pressure air for operating the ejectors enters by the inlet pipe j flowing 1 down the air main is it passes through the dirt box m and discharges into the receiver 11. after passing the reflux valve 0. From this receiver it flows upward by the pipe 01/ to the alternating valve 29 then passes to either of the automatic valvesg and the ejectors 'r' r by the pipe Qi aving discharged the liquid from the ejector. the air returns through the same pipe Q to the automatic valves Q and thence to the di fier: ential exhaust valve 8. This being closed the air finds a passage down thetP pQ/K leading to the non-return valve 14, after passing this valve the air travels through the pipe t to the motor A, by a connection not shown, which recom'presses a part oftheair and discharges the same into the receiver n, by the pipe 17/, after passing thenon-return valve 4), the connection between. the. .colilpressor and the pipe 01/. notzbeing shown. The air that is not required by the. .compressor escapes from the compressorexhau'st on the engine, up the pipe '10 to the atmosphere. .1. .i

The valves are. jo'perated by compressed air flowing through small pipes, and forthe purpose of explanation a diagram (not to scale) is given. In Fig. 4 the cross hatchirfg indicates parts filled with compressed air. In the ejector not hatched; compressed air is about to discharge liquid from the ejector. In the diagram .the right-hand ejector has just discharged, and the, lefthand ejector is about to do so. Taking the lefthand ejector, it can be seen thefioat 3 has risen throwing over the slide valve 4 which has opened theaport 5 allowing the compressed air fromthe main supply pipe 11, which is connected to, the slide valve chest to pass up the pipe 6and ,drivcbver the automatic valve 9 closingthe exhaust port 7 andopening the air port 8. The air is able to drive over the automatic valve, as described since it will be observed that atthe same time the slide valve 4L opens the port v5,

' it opens the port. 9 to exhaust thus releasing the pressure from the pipe 9. Again this releasing of pressure allowsthe. alternating valve 2; to be driven over by the pressure from theopposite end, and so opening the port 10 allowing direct communication between the main air inlet 11 and thezconnecting mains l2 and the ejector 1a. This releasing of pressure allows of the fall of the intercepting valve 13 which closesv the port 14L the valve being held tightly on its seat by the pressure in the pipe 15. .It .will be observed that the differential exhaust-valve s is open allowing communication from the automatic valve 9 and exhaust port 7 which is closed, to the atmosphere. All: these valves remain in this position .while the air is discha'rgingthe liquid in the ejector 1".

This being completed the float 3 falls, the

slidevalve I opens the port9 to .air pressure and opening port 5 to anjexhaust, not shown. The pressure is released on one end of the automatic valve 9 and the said \valveais driven over from the opposite endby the pressure passing up the pipe 9 from the port 9. The air port 8 is closed and the exhaust port 7 is opened. Again at the sametime alternating valve 29, in spite of the pressure in the pipe 9 and 17 (which it will be seen is in connection with port 9) remains where it is, owing to the pressure. at the opposite end, but the intercepting valve 13 is forced upward by the pressure opening the port 14 and allowing the difierential exhaust alve .afi .be d iven over- 1 flhe ha n a ad e c d ro .theprp si en o s t oughihl P9??? M9 he. WWH PE v ve dth nce to th np miby a i'... 2

p p Ag in. thisclQ s he nqrtl mih sh p ls: the. exhaus ai l r m the .QJ'Q PQ L IP steadoffinding its way to the atmosphere L01 W h ough hevalv au. a ir paf theaihinOtor'; assuming; that this ejector which has just discharged beiiore the other becomes full the alterna tingi valve 40' rema ns. wher itis, th d fi e tielns ihaust s remains where it is, the automatic valve 9 p n h ai a d slo s; eerl e while the; intercepting valve 13 j v opensand closesiat the samatime. as they moveme'ntof the slide valve l,-.but the passage of theair does not operate the differential; exhaust as the valveis Qalreadyin its right place remains so ,untilthe other ejector comes into action. uA s long as this ejector alone fills and. empties this a.ction,continues, When the jother ejectornfillsv and has discharged the liquid it closes its own difierential exhaust and. it cannot fail it o, open the exhaust for the other, whether there is any exhaust air remaining (to be liberated or no t so by this simple means, .We. secure a perfecfltfaumatic safety attachm'ent,;in the event -of failure of the motor.. In other words, either ejector will releas'e..,the, exhaust for {its fellow and so automatically cutout the ,jmoto'r in the event of failure. In the event; of

' valve 13 being closed beforethe valvens has been driven over, and thereby theexha'ust being prevented. from escaping, the air contained in the cylinders can exhaust through a port in the casing 14 Thisportds c'losed b'y the stem of the valve 13 when the valve is raised, but when. the valve is closed the exhaust caniescap e from thevalve s through a channel I3 in the stem of the valve and out at the port, the stern ofthe valve thus it intercepts, the .passage of thefair. and delays. the'action of the djijierentialiexhzuist If there were no,- intercepting valve the difierential exhaust would drive over at acting as a slide valve to open and close the port.

Ma -n once at the same time as the alternating valve, and the exhaust from the ejector that had just discharged would at once escape to the atmosphere instead of being stopped and so flowing to the motor. By opening the two by-pass stop valves the ejectors return to the simple conditions of Working and are then as independent of the motor and accessory valves as if they did not exist.

It is obvious that by this simple automatic device either ejector can out out the motor and at the same time safeguard their own continuous Working.

What I claim and desire to secure by Letters Patent is 1. In pneumatic ejectors the combination of a motor adapted to be operated by the exhaust from the ejector; an air compressor for the purpose of recompressing a portion of the exhaust and means for opening and closing the exhaust ports.

2. In pneumatic ejectors the combination of a motor adapted to be operated by the exhaust from the ejector; an air compressor for the purpose of recompressing a portion of the used air; a differential valve for opening and closing the exhaust ports and means for conducting the exhaust air to the motor and compressor.

3. In pneumatic ejectors the combination of a motor adapted to be operated by the exhaust from the ejector; an air compressor for the purpose of recompressing a portion of the used air; a difierential valve for opening and closing the exhaust ports and an intercepting valve for delaying the return of the differential valve and allowing one ejector to be discharged While the other is exhausting to the air motor.

In Witness whereof, I have hereunto signed my name in the presence of two subscribing Witnesses.

EDWARD OYRIL BOWDEN-SMITH.

Witnesses:

LoUIs BELRosE, FRANK B. RAIRDEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

